hayden



UNITED Sierras HIRAM Vi". HAYDEE, OF VIA, ERBUEY, CONNECTICUT, ASSGNOR TO HOLMES, BOOTH Se HAYDENS, F ,NEW YRK, N. Y.

METAL TUBE SPECIFICATION forming part of Letters Patent No. 388,867, dated September 4, 1888.

Application filed June l2, ISES. Serial No. 270.874. (No model.) Y

To @ZZ whom it may concern.'

Be itknown that I, HIRAM YV. HAYDEN, of Wraterbury, in the county of New Haven and State of Connecticut, have invented a certain new and useful Improvement in Tubing, oi"

which the following is a specification. y

This improvement relates particularly to tubing ofthat kind which has two ducts or compartments.

I will describe tubing embodying my ixnproveinent, and then point out the various novel features in the claims.

In the accompanyingdrawings, Figure l is an end view of a piece of metal as the same appears at one stage in the manufacture of my tubing. Fig. 2'is an end View of a piece of thetubiug completed.. Fig. 3 is amend View of tubing of diiferent proportions. Fig. i is aperspcctive View of a? piece of'tubing corre- 2o spondingwith that illustrated in Fig. 2.

Similar letters of reference designate corresponding parts in all the figures.

A designates a'strip of metal-such, for instance, as brass-of which the tubing is formed. This strip of metal is first bent transversely by means of a die, a pair of rolls, or other suitable appliances into the shape in which it is shown in Fig. 1. It will be seen by reference to this figure that there is amiddie portion, o, ol' the strip of a Width equal to the diameter'of the tubing which is to he mannlactnred and that this middle portion is left -nnbent. From this-middle portion the side portions of the stripA are bent. These side portions are bent iu arcs a al, which correspond With the curvature ol thc tubing and are quadrants ofthe circle ol' the tubing. The lateral. extremities' a a4 of the strip extend tangentiaily from these quadrant-arcsin re- 40 verse directions and so as to be parallel with the middle portion, a, of the strip..4 The tau` gential portions o* a areL of such length as that they can be bentl to cont-inne the lcircle of which the ares a o2 form parts. The bending i secure by Letters Patent, is-

of these tangential portions a3 a, which complete the circle, may be effected by drawing the strip lengthwise through a round hole or by means of a die. after this nal bending shall have been comf The edges of the :strip pleted will be united to the central portion, 5o a, of the strip4 by hrazing, soldering, or in any other suitable manner. The tubing thus made willbe cylindrical and divided into two equal parts, as may be understood by reference to Figs. 2 and fi. If the portion a is located 55 nearer one of the side edges than the other, it will not be in the position of the diameter of the completed tubing, but off to one side,and will divide the tubing into two ducts or compertinents of unequal size, as may be nnder- 6o stood by reference to Fie. 3.

lt is not essential that the tubing made in the manner described shall be cylindrical. It may, if preferred, be made of oval or other shape.

It will be seen that in tubing constructed as described the joint between 4Lhe edges ol" the strip out of which the tubing is made and the portions of the stripv contiguous to these edges will not afford any opportunity for leakage from one compartment or duct into the other.

This tubing is admirably adapted for use in gas-x'tures fitted with burners for gas, and with electric light-s or lain ps, because the Wires for the electric lamp may pass th rough one duct or compartment and the gas may pass through the other duct or compartment without-any danger of leakage ol'gas from its duct or compartment into the other.

The small tubing made upon this principle Lmay be bent inanydireeticn to lit it for use in chandeliers or oth crarticles. Large tubi ng may be bent iu the direction of the lint sido of the central portion forming the partition between S5 the ducts or compartments, but not readily edgcwisc of Said partition.

This tubing is extremely simple and cheap and obviates that objection which arises from the liability of leakage from one duetor coin- 9o partinent to another duct or compartment ol' tubing.

ll/hat l claim as my inventiomand desire to l." As a new article of. manufacture, tubing formed oi'a single strip of metal with a partition extending through it, substantially as specified.-

2. As a new article of manufacture, tubing mediate portion in reverse direct-ions 'back to formed of n Singe strip of metal with n pzutithe middle o1' intermediate portion and joined tion inside of the tubing undjoints outside of thereto, aubsmntinlly as Specified'.

the partition, substantially as Specified. yTill-Lfd W. HAYDEN. 5 3. As a new article of' manufacture, tubing Witnesses:

formed of a single strip of meta-l having the C. F. MERRIMAN,

side portions bent; from n. middle or intr- CLIFFORD J. HAUKETT, 

